Hellenic Telecommunications Organisation S.A., OTE Group is the largest technology company in Greece. It is one of the three largest companies listed in the Athens Stock Exchange, according to market capitalization.

OTE Group offers fixed-line and mobile telephony, broadband services, pay television and integrated Information and Communications Technology (ICT). At the same time, the Group is involved in a range of activities, notably satellite communications, real-estate and professional training. Formerly a state-owned monopoly, OTE's privatisation started in 1996 and is now listed on the Athens and London Stock Exchanges.

Today, OTE Group employs about 13,000 people in Greece and approximately 20,000 in total. Since July 2009 Deutsche Telekom is the largest shareholder of the company.